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doc Resize Root Disk Image /doc/resize-root-disk-image/
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Resize Root Disk Image

The safest way to increase the size of root.img is to turn your TemplateVM into a StandaloneVM. Doing this means it will have it's own root filesystem (StandaloneVMs use a copy of template, instead of smart sharing). To do this run qvm-create --standalone from dom0 Konsole.

Resize a StandaloneVM Root Image

In dom0 Konsole run the following command (replace the size and path):

truncate -s 20G /var/lib/qubes/appvms/standalonevm/root.img

Then start Terminal for this StandaloneVM and run:

sudo resize2fs /dev/mapper/dmroot

Shutdown the StandaloneVM and you will have extended the size of it's root.img

Resize a TemplateVM Root Image

Shut down the TemplateVM, as well as all VMs based on that template (since they share root.img). In dom0 Konsole run the following command (replace the size and path): Make sure changes in the TemplateVM between reboots didn't exceed 10G.

truncate -s 20G /var/lib/qubes/vm-templates/fedora-21/root.img

Then start only the TemplateVM and run the following. Note that if you are resizing the TemplateVM used by, e.g., your NetVM, you may need to disable networking so when the TemplateVM is started, it does not autostart other VMs based on the same root.img. Otherwise you will get an error message Nothing to do!.

sudo resize2fs /dev/mapper/dmroot

Shutdown the TemplateVM and you will have extended the size of it's root.img.